Pumps, blowers, compressors, and the like



Nov. 23, 1965 s. l. KRONENBERG 3,219,262

PUMPS, BLOWERS, COMPRESSORS, AND THE LIKE Filed April 10, 1961 2 Sheets-Sheet 1 QIIMQ'GGQQMQDDDDDD i /O .z I fr F! I II] 11'. I O 1 I E4 :2 E 0 E5 E3 E1 H g INVENTOR. SAMUEL l. KRONENBERG ATTORN EY Nov. 23, 1965 S. l. KRONENBERG PUMPS, BLOWERS, COMPRESSORS, AND THE LIKE Filed April 10, 1961 2 Sheets-Sheet 2 PIC-3.4

INVENTOR.

BYSAMUEL l. KRONENBERG ATTORNEY United States Patent 3,219,262 PUMPS, BLQWERS, COMPRESSORS, AND THE LIKE Samuel I. Kronenberg, 58 Meadowbrook Road, Longmeadow, Mass. Filed Apr. 10, 1961, Ser. No. 102,032 1 Qlaim. (Cl. 230117) The present invention relates to compound pumps, compressors, and blowers.

In each of the fields where the above are used, there is a substantial demand for equipment characterized by substantially increased performance without proportionate increase in production costs. The principal objective of the present invention is to provide such equipment and it is attained by providing a body having an inlet and an outlet with first and second impellers arranged in series therein. The first impeller is the nearer to the inlet and the volumetric capacity of the second impeller is such that the inter-impeller pressure is less when both impellers are in service than is the pressure on the discharge side of the first impeller when only it is operative.

While the invention is equally adapted to blower and pump fields, it is herein discussed with particular reference to vacuum cleaners as in that field, the demand is for cleaners that have increased performance characteristics while the competitive situation is such that price differentials cannot be substantial.

In the accompanying drawings, there are shown illustrative embodiments of the invention which enable its novel features and advantages and other of its objectives to be appreciated.

In the drawings:

FIG. 1 is a partly sectioned side view of a unit in accordance with the invention for use in a vacuum cleaner,

FIG. 2 is a unit illustrating another embodiment of the invention,

FIG. 3 is a somewhat schematic view illustrating the manifolding of two units of the type shown in FIG. 1, and

FIG. 4 is a view of a unit in accordance with another embodiment of the invention which is characterized by both impellers being driven by the same motor but with the second impeller larger than the first impeller.

In the embodiment of the invention illustrated by FIG. 1, a generally indicated unit is shown as having a shroud 11 in whose lower end there is a housing 12 which supports a motor 13 and establishes a fan chamber 14 having a central air inlet 15. The chamber 14 is divided by an inwardly disposed set of fixed blades 16 between rotating fans 17 and 18 fast on the motor shaft 19. The motor 12 is shown as encased within a shell 20 receiving air drawn into the unit and having an outlet 21 of a size that is less than the diameter of the rotating fans.

In the upper end of the shroud 11, there is a housing 22 having an inlet 23 and within it, there is the identical arrangement of fixed blades and rotating fans as are within the housing 12. The housing 22 is different in that it has laterally disposed outlets 24 and that its motor, not shown, but located within the casing 25, is of the type cooled by an air stream entrant through the axial inlet 26 and discharged laterally through ports 27.

In FIG. 2, there are shown two such units 10 having "ice their inlets connected by a manifold 28 having an inlet 29.

In FIG. 3, there is shown a unit 30 consisting of a shroud 31 having a generally indicated assembly 32 in its lower end. The assembly 32 consists of a housing 33 provided with an inlet 34 and suporting the motor 35 within a casing 36. The housing 33 has within it an impeller in the form of a fan 37 driven by the motor 35 and discharging air into the casing 36 and through its outlet 38, smaller in area than the fan 37.

In its upper portion, there is a generally indicated assembly 39 which is identical to the assembly 32 except that it may be driven at a faster rate or may have its impeller 40 of larger size than the impeller of the assembly 32.

In FIG. 4, there is shown a generally indicated unit 41 consisting of a shroud 42 having an inlet 43 and a somewhat smaller outlet 44. Within the shroud 42, there is a housing 45 having an inlet 46 and opening upwardly into the shroud 42. The housing 45 supports a motor 47 whose shaft 48 carries a fan 49 adjacent the inlet and a fan 50 adjacent the outlet, with the fan 50 being larger than the fan 49.

In all illustrative embodiments of the invention, the spacing between the impellers is such that they may be said to be in phase by which is meant that the discharge of the first impeller is delivered to the inlet side of the second impeller to minimize inter-impeller turbulence and to ensure the maximum eificiency of the second impeller with respect to the moving fiuid stream.

With units in accordance with the invention, it will be found that substantially improved performance results measured by water lift at their inlets, cooler operation of the motors driving the first fans, and a marked improvement in the volumetric capacity of the first fans or impellers.

I claim:

In a device such as a pump, compressor, and blower, a causing having an inlet, an outlet and first and second units arranged in series within said casing, with the first unit adjacent the inlet and the second unit adjacent the outlet, each unit including an impeller and impeller driving means, the volumetric capacity of the second unit being greater than that of the first unit, the second unit having a central inlet and the first unit having a central, forwardly and inwardly tapering outlet spaced from said inlet, each of lesser diameter than the impeller of that unit.

References Cited by the Examiner UNITED STATES PATENTS 1,234,598 7/1917 Wynn 230 2,175,641 10/ 1939 Replogle 15-327 2,726,807 12/1955 Lewis 230130 2,970,750 2/1961 Swearingen 230-130 2,981,464 4/1961 Omohundro 2301 17 FOREIGN PATENTS 729,618 7/ 1932 France.

KARL J. ALBRECHT, Primary Examiner.

LAURENCE V. EFNER, JOSEPH H. BRANSON, IR.,

Examiners. 

